public class CargoBoat {
	int realContent;  //装载的重量
	int maxContent;   //最大装载量
	public void setMaxContent(int c) {
		maxContent = c;
	}
	public void loading(int m) throws DangerException {
		realContent += m;
		if(realContent>maxContent) {
			throw new DangerException(); 
		}
		System.out.println("目前装载了"+realContent+"吨货物");
	}
}
